ES2232447T3 - SYSTEM FOR CHECKING THE TIRE PRESSURE OF A MOTOR VEHICLE TIRES. - Google Patents

Abstract

System for checking at least one state parameter of a tire for a motor vehicle, comprising: - at least one tire wheel (1) comprising a tire (2) mounted on a mounting rim (3); - an internal tube (4) inserted in the defined cavity between the tire and the tire; - a measuring device for measuring said at least one status parameter associated with said wheel; - a transmission device designed to transmit a signal indicating the value measured by said measuring device, said transmission device including a power supply battery; - a receiving device designed to receive said signal indicating the value measured by said measuring device; - a sensor to detect the movement of said wheel, designed to allow the activation of said transmission device when said wheel moves; characterized in that said transmission device, said measuring device and said motion sensor are housed in the same container that is inserted into a wall of said internal tube in a radially internal position with respect to said wheel.

Description

System to check the inflation pressure of The tires of a motor vehicle.

The present invention relates to a system to check the tire inflation pressure, at a wheel of pneumatic and to an inner tube comprising devices for Check the tire inflation pressure.

A check system according to the preamble of claim 1 is known from US 4 311 985 TO.

The wheel is the component that provides a connection between the vehicle and the road; performs the function of provide pneumatic support to the vehicle and its load and of ensure, by means of the tire, a grip performance to the proper road. Vehicle support is provided by the volume of pressurized air contained inside the wheel.

The tire comprises a toroidal structure internally hollow formed by a plurality of components and, mainly, by a textile or metal shell fabric that has two heels, each defined along an edge internal circumferential of the housing to fix the tire to the corresponding support rim. It also comprises at least one pair of annular reinforcement cores - usually called "wires of heel "- which are circumferentially inextensible and are inserted into said heels (usually at least one wire of heel by heel).

The shell fabric includes a structure of support comprising textile or metal ropes, extends axially from one heel to the other to form a structure toroidal and has its end edges each associated with a corresponding heel wire.

In tires of the type called radial, the strings cited above are substantially placed in planes containing the axis of rotation of the tire.

On the periphery of this housing is arranged an annular superstructure, known as a waist structure, that It is usually composed of one or more bands of rubberized fabric that are superimposed on each other to define a so-called "package of waist ", and a tread made of material elastomer, wrapped around the waist pack and molded with a high design for the tire rolling contact on road. In addition, the housing is provided, in positions axially opposite sides, of two flanks that are made of elastomeric material and each extends in the radial direction outward from the outer edge of the associated heel.

In tires of the type called without a tube, it is say, they do not require the use of an internal tube during their operation, the internal surface of the housing is normally coated with a so-called coating, mainly one or more layers of elastomeric material that are impervious to air. Finally, the housing may comprise other known components, that is, edges, ribbons and fillings according to the tire design specific.

A tire wheel for vehicles comprises a tire that defines a toroidal cavity and is mounted on a corresponding tire, which has a bottom surface provided with a central hollow and two heel seats on which the heels of the tire rest on contact and that each one is axially delimited between a radial end surface (lateral) in an axially external position and an annular projection opposite, axially internal, to fix the heel on the seat correspondent.

In a tire of the tubeless type, the air pressurized is contained between the tire and the rim of support. The coating layer arranged on the surface Inner tire is designed to keep the air pressurized inside the latter. This tire usually it swells through a swelling valve that is usually placed on the neck of said tire.

A tire of this type is described for example in patent application EP 928680 A.

Another solution to maintain the ability to Tire support consists of the use of an inner tube that inserted between the tire and the tire and swells with air pressurized introduced in the inner tube by means of a valve swollen protruding out of the wheel.

The inner tube, which is inserted between the tire and the tire, comprises an expandable tubular body in bull shape that is usually made of elastomeric material and It is inflatable through an associated inflation valve.

The valve to swell the inner tube usually it comprises a base for its connection to the inner tube and a cylindrical housing (stem) that is fixed to the base and that has placed inside the activation mechanism for swelling and deflation operations.

A tire that is not swollen properly reduces vehicle efficiency; produces, in particular, a increase in fuel consumption, a deterioration of maneuverability characteristics, and increased wear of the pneumatic, to mention only the inconveniences main.

Therefore, it is of the utmost importance to be able to continuously monitor the pressure trend in the vehicle tires

US 5540092 describes a system for monitor the pressure in a tire, which comprises a unit of pressure detection and a unit to transmit a signal coded to the vehicle equipped with the tire. The unit of transmission can be mounted inside or outside the tire. The transfer of this encoded signal occurs by an inductive coupling between the transmission unit and A fixed antenna A battery supplies power to this unit of transmission.

US 5900808 describes a system for detect a low pressure in a tire, comprising means of low pressure sensor powered by a battery and a radio frequency transmitter to transmit the generated signal by these sensor means to a receiver. The system too comprises switching means designed to allow the activation of the transmitter when the sensor means indicate a low pressure condition inside the tire. The life of the battery is preserved, since the transmitter is activated only when required to transmit a signal to the receiver.

US 5562787 describes a process to monitor the conditions of a vehicle tire, by example the pressure and the temperature of the air inside the tire. The procedure uses a program device that is feeds itself that is mounted on the inner surface of the pneumatic or is inserted into the wall of the support rim said tire. The device comprises a supply source of energy that can be activated or deactivated using a device switching, a sensor designed to monitor information cited above, an integrated circuit, an amplifier and a antenna.

A transceiver, which is located in the vehicle or in a remote position, interrogates the programmable device that feeds itself, which responds with a radio frequency signal that contains the required information. The programmable device that feeds by itself it is activated by said remote transceiver, which drives the switching device that causes the activation of the source of energy supply.

Applicants have realized that, in the Current technique, devices to measure physical parameters such as, for example, the pressure and temperature of a wheel of tire and devices to transmit the values of these parameters are also fed during conditions not operational, for example when the vehicle is stationary, or activated through a command that is generated outside the wheel and on which the decision to provide information on the status of said tire wheel.

Applicants have considered the problem of provide a system to monitor operating conditions of a tire wheel, for example pressure and temperature of the air inside the tire itself, in which the detection of these conditions is performed during the displacement of the vehicle without the need to activate a command from outside of said tire wheel.

Applicants have found that, using a motion sensor arranged inside the wheel pneumatic and that can detect the movement of said wheel, is possible to measure only during conditions desired operations.

In particular, the motion sensor allows the supply of a sensor that is arranged inside the wheel, on the support tire of said tire or on the inside the inner tube, and that measures these conditions operational

A first aspect of the present invention is refers to a system to check at least one parameter of condition of a tire for a motor vehicle according to the characteristics of claim 1.

Preferably, said motion sensor is a accelerometer switch.

Preferably, said device for measuring by At least one state parameter is a pressure sensor.

Preferably, said device for measuring by At least one status parameter is a temperature sensor.

In particular, said transmission device It comprises a power supply battery, a device for measure the voltage of said battery and transmit the value of the voltage measured by a radio frequency signal.

The system also comprises a device for display said signal indicating the value measured by said measuring device.

Preferably, the inner tube has at least minus two compartments that are separated from each other and each provided with said measuring device.

Another aspect of the present invention relates to to a vehicle tire wheel according to claim 9 or claim 13.

Preferably, said motion sensor is a accelerometer switch.

Preferably, said device for measuring by at least one parameter of a tire's condition is a sensor of Pressure.

Alternatively, said device for measuring at least one parameter of a tire's condition is a sensor of temperature.

Other features and advantages will become more clear from the detailed description of an embodiment preferred, but not exclusive, of the different aspects of the present invention

This description will be provided below. with reference to the attached drawings, provided only for illustrative purposes and, therefore, of a non-nature limiting, in which:

- Figure 1 shows a block diagram of the transmission section of the device to check the pressure of air;

- Figure 2 shows a block diagram of the receiving section of the device to check the pressure of air;

- Figure 3 shows an embodiment of the transmission section of the device to check the pressure of air;

- Figure 4 shows a cross section of an inner tube of a tire according to an embodiment of the present invention;

- Figure 5 shows a cross section partial axial of a tire mounted on the respective tire that it comprises an inner tube;

- Figure 6 shows an embodiment of a tube internal according to the invention;

- Figure 7 shows a cross section of an inner tube of a tire according to a different embodiment of the present invention;

- Figure 8 shows a cross section of an inner tube of a tire according to another embodiment of the present invention;

- Figure 9 shows a cross section of a tubeless tire according to another embodiment of the present invention.

Figure 1 shows the block diagram of the transmitter 600 of the device to check the air pressure in the tires of a vehicle according to the invention. It consists of a battery powered electronic circuit that transmits by electromagnetic waves, preferably at a radio frequency of shortwave, in a frequency range between 100 kHz and 1000 MHz, even more preferably digitally, information related to the operational parameters of the tire, in particularly, but not exclusively, related to the pressure of swollen. This transmitter 600, which is installed inside at least one tire wheel of the motor vehicle comprises The electronic circuit and the power supply battery. For keep the dimensions as small as possible, the transmitter 600 preferably uses SMD technology (Mounting Device Surface) for the assembly of the components, while, for reduce consumption to a minimum, components are preferably used CMOS electronic devices.

This transmitter 600 comprises a battery 601 that represents the power source to power the transmitter 600. It preferably consists of several lithium elements that are inserted inside a special container and that are connected in series; the 601 battery provides a voltage of 4.0 V and has a capacity of 150 mAh. The 601 battery is connected to a voltage regulator 603 that regulates the supply voltage supplied by the 601 battery, stabilizing it at 3 V. The voltage regulator 603 is preferably an integrated circuit with a low input current and a minimum voltage difference input / output, for example the MC78LC30 integrated circuit manufactured by Motorola

The output of voltage regulator 603 is connected to a 604 microcontroller (for example PIC16LC711 manufactured by Microchip).

The 604 microcontroller has the function of control the transmitter 600 according to a logic control programmed in its interior and described below. Receive the information from by at least one pressure sensor 605, a measuring device of the voltage 606 and an accelerometric switch 602. The microcontroller 604 processes the information received and sends it to a circuit transmitter 607, which in turn radiates it through an antenna 608.

The 605 pressure sensor, which measures the pressure of swelling of the tire, for example the sensor SM5310-060AH manufactured by Exar. It consists of a Pressure sensor compensated with temperature. To reduce the power supply current consumption, the sensor pressure 605 is operated only when microcontroller 604 It requires a reading.

The voltage measuring device 606, which It is connected directly to the 601 battery, it will be read by the 604 microcontroller whenever the charged state of the 601 battery.

The 602 accelerometric switch, for example the model 6200-9 manufactured by Aerodyne, which depends of the motion sensor, it has contacts that close automatically when an acceleration value is reached predefined When the wheel starts to move and the switch accelerometer 602 reaches the predefined acceleration value, by 1.5 g example, close your contacts, informing the 604 microcontroller that the vehicle moves. As an alternative to the 602 accelerometer switch it is possible to use other models of motion sensors, for example of the piezoelectric type.

The transmitter circuit 607 is a circuit that stabilizes with frequency using a SAW resonator (Wave Surface Acoustics), at the frequency of 433.92 MHz. It is connected directly to the 601 battery to be able to have the maximum available voltage. It can supply a power of about 4 mW, with ASK type modulation (Phase Shift Amplitude).

The 608 antenna is made with a short section of cable, whose length depends on the transmission frequency: in the case of a transmission frequency of 433.92 MHz is one length of about 5 cm.

Figure 2 shows the block diagram of the receiving section 700 of the device for checking the pressure of tire air. It consists of an electronic circuit Powered by car battery. The signal is received by the antenna 701 that is connected to a receiver 702 (for example the model RXNB-CE / 433) manufactured by Auriel). The signal received, converted properly, is sent to a 703 microcontroller (for example PIC16LC711 supplied by Microchip) Microcontroller 703 operates, according to the program recorded on it, a 704 display system for the information received The 704 display system can be built in two versions, which can be detected automatically using microcontroller 703 based on the consumption of stream. A first embodiment of the display system 704 It comprises a pair of LEDs for each wheel, which indicate respectively, by a change in color, that the tire has a pressure less than a predefined value in advance and that The battery that powers the transmitter 600 starts to discharge. A different embodiment according to the invention comprises a display device that indicates, in digital form, the value pressure of each tire and the tension value of the drums.

The 702 microcontroller automatically adapts to the 704 display system used, choosing the corresponding one drive procedure

The system to check the air pressure according to the programs stored in microcontrollers 604 and 703 It works as described below.

When the motor vehicle starts to move and the centrifugal force reaches 1.5 g, which corresponds to about 8 km / h, the transmitter 600 is activated, microcontroller 604 reads the value of the pressure sensor 605 and / or battery voltage value 601 and transmits the information, for example, 14 times in succession. In this point, to save battery power, the 604 microcontroller assumes a completely inactive state during a first period of predefined time (for example 2.3 s); during this time only the memories and the timing oscillator (in the inside the microcontroller 604) remain functioning. In the end of this first period, check if a second period of predefined time (an interval that defines the time between successive sensor reading operations), for example 3 minutes; if it has not passed, it assumes the inactive state again during a time period for example equal to the previous time; yes it has Lastly, read the pressure sensor again. In case there is after a third predefined period of time (interval between successive transmissions), for example 21 minutes since the last transmission, or in the event that a pressure difference is detected between the last measurements made that is greater than a limit predefined, performs a new transmission (preferably 14 times in succession) of the correlated information.

To avoid overlapping transmissions of several 600 transmitters with each other, alternate temporarily. In in particular, the plurality of transmitters 600 installed in a Motor vehicle has an identification number. Each number of identification has, associated with it, a delay time predefined that is proportional to it. Signal transmission occurs in the previously defined transmission time (21 minutes or when a malfunction occurs) plus the time of delay defined above. In this way, the transmissions they are temporarily alternated with each other and do not overlap, avoiding Possible loss of information.

When the motor vehicle stops and the 602 accelerometer switch opens its contacts, the 604 microcontroller ensures that the transmitter 600 circuits are activate and remain in operation for another period of predefined time, for example between 30 minutes and 2 hours, following those who are switched to a completely state inactive until the motor vehicle starts to move another time. In this way it is possible to distinguish between temporary stops of the vehicle (for example, stops at traffic lights or traffic jams traffic), where the system must remain operational, and stops prolonged (for example in car parks), where the system has to shut down. Given the distortion of the signal due to the reflection of the radio signal or falls in the carrier caused by the rotation of the wheel and, therefore, a continuous change in antenna position (different polarization of the two transmitting and receiving antennas) or interference of a electromagnetic origin, the signal can reach receiver 702 of a distorted or incomplete form. Thus, measures have been introduced. to limit to a minimum any incorrect interpretation of the received signal

The information is transmitted through the transmitter 600 for example by means of an ASK type modulation, to through successive bit sequences, where the total number of bits is equal to 26, and comprises a start bit with a duration equal to 120% of the bit period.

Each transmission made through each transmitter 600 repeats a predefined number of times, for example 14 times in succession.

The 703 microcontroller, through a control logic recorded in memory, for example checking the duration of the period of a single bit and its half cycle, analyze the first bit sequence received and, only if all the bits that the form are within a predefined tolerance, all the transmission. If one or more bits are outside the tolerance range, the bit sequence will not be accepted as a whole, but only the value and position of those bits that will be accepted and saved have been received correctly. Receiving the same signal 14 times in succession, the system can reconstruct the entire sequence, adding in memory the bits that are initially missing, but received later, throughout the sequence of the fourteen transmissions When the tires, and therefore the associated devices to check air pressure (600 transmitters and 700 receiver) are mounted on a motor vehicle For the first time, its initialization is done automatically. The tires, once they start moving, they transmit the information as described above. The 703 microcontroller Save the transmitter identification code - and so both of the wheels- present in the motor vehicle. He 703 microcontroller is programmed to compare this code of identification with that of successive transmissions and accepts only in code received several times in succession, discarding incorrect identification codes (different from saved during initialization) for example transmitted by another motor vehicle that has the same control system as pressure and that is present in the proximity. This function is always active to prevent the transmission of any transmitter that does not belong to the motor vehicle that enters the system control of the vehicle itself. In addition, as a result it is not necessary perform no manual initialization of the devices Air pressure check in case of replacement of one or more tires and / or transmitters.

The 600 transmitter, including the batteries, is preferably formed and contained in a container of form cylindrical 801, as shown in figure 3. It has a thread 802 (for example M 16, step 0.75) to be able to attach to a sleeve threaded 21, and a flange 803 that comes into contact with the sleeve 21. The dimensions of this container 801 without flange 803 are 14.75 mm for the external diameter and 30 mm for the length, for a weight total of about 10 grams.

The 802 thread allows a quick replacement of the 600 transmitter in case of maintenance. In addition, the assembly of the transmitter 600 can be performed at the time of mounting the internal tube in the tire, thus avoiding possible damage during the movement of the internal tubes.

Figure 4 shows a cross section to through an inner tube 900 of a tire according to one embodiment Preferred of the present invention. Show a 600 transmitter mounted on a threaded sleeve 21 and a inflation valve 450 of the traditional type. The inflation valve 450 comprises a base 451 which has, inside, the activation mechanism for the swelling and deflation operations, and a cylindrical shell 452 (stem) fixed to base 451.

The stem 452 of the valve is usually housed in a special hole provided on the surface of the bottom of the flange, and more precisely on the wall of the hole, from which it protrudes to the external environment, at atmospheric pressure, with the corresponding end closed by a plug.

The transmitter 600 to check the pressure of Tire air of a motor vehicle is mounted on said conventional internal tube in a diametral position (at 180 °) with respect to the inflation valve 450, so that the weights are distributed in a balanced way so that the tire does not unbalance during rotation.

The transmitter 600 is located in the part of radially internal wall (on the intradosal surface) of the tube internal 400 to face the central hollow of the flange on which the inner tube and the tire will be mounted. From this way, there is enough space to hold the outgoing part of transmitter 600 and sleeve 21; In addition, they do not come into contact with the radially internal surface of the tire, avoiding possible damage to the tire (abrasions) and the transmitter 600.

In Figure 5, numerical reference 1 indicates in a partial cross-sectional view a wheel for vehicles comprising a tire 2, a tire 3 and an inner tube 4 inserted into the defined cavity between the tire and the tire.

The tire 2 comprises a toroidal housing 5, flanks 6 ending in a pair of heels 7, a tread 8 provided on its radially external surface with a design of the right tread that includes 100 cavities and grooves 105 and, if necessary, a waist structure 50 placed, on the periphery of the tire, between the carcass and the tread, this structure usually comprising a plurality of bands of rubberized fabric that are radially overlapping and reinforced with textile or metal ropes that are parallel to each other in each band and intersect with respect to adjacent bands and preferably placed parallel to the equatorial plane in the band radially more external.

The tire 3 comprises a bottom surface 9 provided with a central hollow 10 and two heel seats 11 that are lateral with respect to the hollow and against those who lean on butt the heels of the tire; each seat is axially defined between a radial (lateral) end surface 12 in a position axially external and an axially internal annular projection 13.

A hole 44, inside which a common inflation valve 90 for tubeless tires, is formed advantageously in the wall of the gap 10.

The inner tube 4 is preferably molded and vulcanized in a toroidal shape to memorize this shape: in other words, when subjected to mechanical stresses that deform, can produce elastic reactions designed to ensure that you regain the original non-deformed form. In in particular, and more preferably, the inner tube is molded and vulcanized with a toroidal shape that has an internal volume not less than a third of the end use volume.

It is particularly advantageous for tires with a "low profile", use an internal tube (figure 6) that is preferably divided into two circumferential compartments A and B which are separated by a central wall 110 of greater stiffness than flanks 115, such as that described in the application for European Patent EP919405, filed by them Applicants

This inner tube is divided into at least two separate circumferential parts, separated by a wall longitudinal, providing said wall, and preferably also to the surrounding area, greater rigidity than the part axially more external, that is, the flanks of the inner tube, of so that, during the swelling of the tube inside the pneumatic, the expansion of the tube in the axial direction is greater than in the radial direction to bring its central portion in contact with the tread area while adapting completely with the sides of the sides of the tire, avoiding thus the generation of abnormal tensions in the walls of the tube.

This inner tube can be obtained preferably by forming the sides of the tubes internal separately from their central part, joining them to then separate the separate parts, advantageously by a chemical adhesion of the associated elastomeric materials during vulcanization of the inner tube.

Obviously, the inner tube can be formed in any other convenient way and can be of any kind, of a single volume and with a plurality of compartments greater than two, arranged as desired.

For the purposes of swelling and deflation of the compartments into which the inner tube is divided, each compartment will be provided with an associated device 14 (figure 15) that it has no part for its connection with the environment external, which passes through the tire.

This device 14 is advantageous during the conditions of rapid acceleration of the vehicle, where there is the possibility that the tire can slide with respect to the rim, with the consequent high risk of tearing of the inner tube at the base of the valve or shear of the valve stem, with the consequent immediate deflation of the tire and the corresponding loss of vehicle stability, putting seriously endangered in this way the lives of the driver and of the passengers of the vehicle itself.

The device 14 for swelling, deflation and calibrating the inner tube comprises a rigid body 15 that is preferably made of plastic material or light alloys of metal. The rigid body 15, which preferably has a cylindrical configuration, it is mounted inside a sleeve special thread 21 (figure 6) defining a circular opening intern formed in the surface elastomeric material radially internal (intrados) of the inner tube.

Preferably, the rigid body 15 cited formerly (external diameter 14.75 mm and length 30 mm) comprises an annular portion of its threaded outer surface (for example thread M 16, step 0.75), to allow it to screw on the sleeve 21, and a base flange 20 that allows to fix its position with respect to to the cuff The rigid body 15 has a total weight of about 10 grams

As can be clearly understood from Figures 5 and 6, the rigid body 15 mentioned above is completely devoid of any part for connection to Ambience outside the wheel. In addition, the inner tube provided with this device is free to move in any position in the inside the cavity defined by the tire and the wall of the tire.

In particular, the swelling of the inner tube is performs by introducing pressurized air into the space between the tire and rim, to deform the tube with respect to its initial configuration, thus creating a pressure difference between the internal volume of the tube and the internal space, pending therefore restoring the balance between pressures in the environments mentioned above, corresponding to the return from the tube to its original non-deformed configuration. Later, the air present outside the tube is allowed to flow into the surrounding atmosphere, thus allowing its own expansion tube until it completely fills the cavity between the tire and rim.

Then the correct value is reached and predefined air pressure inside the chamber releasing the air that creates an overpressure with respect to the desired value, by a device that is properly calibrated to said value.

The valve, which has no part for its connection to the external environment, it can also comprise one or more independent elements (input, calibration and discharge) that are separated from each other, and may also not have any of those elements.

Figure 7 shows a cross section to through an inner tube 900 of a tire according to one embodiment of the present invention, in which it is possible to appreciate a transmitter 600 that is mounted on a first threaded sleeve 21 and a device 14 for inflation, deflation and calibration of the inner tube, which is mounted on a second threaded sleeve 21 which is preferably located in a position diametrically opposite (about 180º) from the previous one for a balanced distribution of the weights.

Preferably, device 14 and the transmitter 600 are placed inside the inner tube 900 so that, when mounted on the respective tire, face the central hole of the tire itself. In this way, there are Enough space for housing these devices.

Figure 8 shows a cross section to through an inner tube 1000, which is divided into two circumferential compartments A and B, according to another embodiment of the present invention A transmitter 600 is mounted on a first threaded sleeve 21 of compartment A and a device swollen 14 is mounted on a second threaded sleeve 21 of the compartment A located 180º from the previous one to balance the pesos.

For an inner tube 1000, which is divided into two circumferential compartments A and B, two are necessary inflation devices 14, specifically one for each compartment. A single transmitter 600, on the other hand, is enough to provide an alert to variations in the pressure of the two inner tube compartments.

In the case where only one transmitter is used 600, it is preferable to use a balancing device 1001 to balance the weights of the inner tube 1000. In this case a inflation device 14 is mounted on a first sleeve threaded 21 of compartment B and a balancing device 1001 it is mounted on a second threaded sleeve 21 of the compartment B located 180º from the first, to balance the weights.

The balancing device 1001 consists of preferably in a container of the same type as the container 801 and preferably having the same weight as the others elements mounted on the inner tube, with the purpose of balance and distribute tube weights evenly internal and, therefore, of the tire.

A higher degree of sensitivity can be obtained with two 600 transmitters, that is, one for each compartment.

Figure 9 shows, by way of example, a wheel comprising a tire 2, of the type known in a manner conventional as a tubeless tire, and a support tire 3. This tire 2 is swollen by a inflation valve 90 which is placed for example, in a way known to itself, on the neck 10 of said tire.

The tire 3 comprises a bottom surface 9 provided with a central hole 10 and two heel seats 11 that are located on the sides of the hole and on which the heels of the tire are supported by stopping; each seat is delimited axially between a radial (lateral) end surface 12 in an axially external position and an axially annular shoulder internal 13.

The tire 2 consists of a structure internally hollow toroidal formed by a plurality of components and, mainly, by a textile shell fabric or metallic 5 that has two heels 7 and 7 ', each defined at length of an inner circumferential edge of the housing to fix the tire to the corresponding support wheel 3. Also comprises at least one pair of annular reinforcing cores -usually called heel wires 71 and 71'- which are circumferentially inextensible and inserted in said heels (usually at least one heel wire per heel).

The shell fabric includes a structure of support comprising textile or metal ropes, which extend axially from one heel to the other to form a structure toroidal and has its end edges each associated with a corresponding heel wire.

In tires of the type called radial, the strings cited above are substantially placed in planes containing the axis of rotation of the tire.

On the periphery of this housing is placed an annular envelope, known as waist structure 50, which is usually composed of one or more bands of tissue rubberized that are superimposed on each other to define a called "waist pack" and a tread 8 made of elastomeric material, wrapped around the waist pack and molded with an elevated design for the rolling contact of the tire on the road. In addition, the housing is provided, in axially opposite lateral positions, with two flanks 6 and 6 'that They are made of elastomeric material and each extends into the radial direction outward from the outer edge of the heel associated.

In tires of the type called without a tube, it is say, those who do not require the use of an internal tube during their operation, the internal surface of the housing is normally coated with a so-called lining 11, specifically one or more layers of elastomeric material that are impervious to air. Finally, the housing may comprise other known elements, that is, edging, ribbons and fillings according to the specific design of the tire

The transmitter 600 of the type described previously, mounted on a threaded sleeve, it is inserted in the support rim 3. This threaded sleeve is formed preferably along the equatorial plane of the tire over said bottom surface 9 of the tire 3.

In these tubeless tires, the transmitter / sensor is inserted from outside the tire by screwing the transmitter itself into said sleeve screwed. This allows quick and easy assembly and disassembly of the transmitter if maintenance or replacement operations are required. In addition, the transmitter inserted in the support rim allows the application of the system to check the air pressure in tires of the traditional type for which no one is required structural modification

In addition, the pressure sensor may be supplemented and / or can be replaced by a sensor of one type different designed to measure at least one state parameter of said tire wheel. The status parameters of a wheel of pneumatic are parameters related to the physical conditions of the wheel, for example the air pressure or the temperature of said pressurized air inside the wheel.

Claims (16)

1. System to check at least one status parameter of a tire for a motor vehicle, which understands: - at least one tire wheel (1) that comprises a tire (2) mounted on a mounting rim (3); - an internal tube (4) inserted in the cavity defined between the tire and the tire; - a measuring device for measuring said by at least one status parameter associated with said wheel; - a transmission device designed to transmit a signal indicating the value measured by said measuring device, including said transmission device a power supply battery; - a receiving device designed to receiving said signal indicating the value measured by said device measurement; - a sensor to detect the movement of said wheel, designed to enable the activation of said device transmission when said wheel moves; characterized in that said transmission device, said measuring device and said motion sensor are housed in the same container that is inserted into a wall of said internal tube in a radially internal position with respect to said wheel. 2. System according to claim 1, characterized in that said motion sensor is an accelerometer switch. 3. System according to claim 1, characterized in that said container is inserted into a sleeve fixed to the wall of said inner tube. 4. System according to claim 1, characterized in that said device for measuring at least one status parameter is a pressure sensor. 5. System according to claim 1, characterized in that said device for measuring at least one state parameter of a tire is a temperature sensor. A system according to claim 1, characterized in that said transmission device, which also comprises a device for measuring the voltage of said power supply battery, transmits the value of the measured voltage by means of a radio frequency signal. 7. System according to claim 1, characterized in that it also comprises a device for displaying said signal indicating the value measured by said measuring device. System according to claim 1, characterized in that it comprises an internal tube with at least two compartments that are separated from each other and each provided with said measuring device. 9. Wheel for vehicles, comprising: - a tire mounted on a corresponding mounting rim; - an internal tube (4) inserted inside the defined cavity between the tire and the tire; - a measuring device to measure at minus a state parameter of said tire associated with said wheel; - a transmission device designed to transmit a signal indicating the value measured by said measuring device, including said transmission device a power supply battery; - a sensor to detect the movement of said wheel, designed to activate said transmission device when said wheel moves; characterized in that said transmission device, said measuring device and said motion sensor are housed in the same container that is inserted into a wall of said internal tube in a radially internal position with respect to said wheel. 10. Wheel according to claim 9, characterized in that said motion sensor is an accelerometer switch. 11. Wheel according to claim 9, characterized in that said device for measuring at least one state parameter of a tire is a pressure sensor. 12. Wheel according to claim 9, characterized in that said device for measuring at least one state parameter of a tire is a temperature sensor. 13. Tire wheel for vehicles, which understands: - a tire mounted on a tire of corresponding assembly; - a measuring device to measure at minus a state parameter of said tire associated with said wheel; - a transmission device, comprising a battery, designed to transmit a signal that indicates the value measured by said measuring device; - a sensor to detect the movement of said wheel designed to connect said battery to said device transmission when said wheel moves; characterized by the fact that: - said measuring device, said transmission device and said motion sensor are housed in the same container; Y - said container is inserted in the rim from the outside of the tire by screwing the container itself into a threaded sleeve 14. Wheel according to claim 13, characterized in that said motion sensor is an accelerometer switch. 15. Wheel according to claim 13, characterized in that said measuring device for measuring at least one state parameter of a tire is a pressure sensor. 16. Wheel according to claim 13, characterized in that said measuring device for measuring at least one state parameter of a tire is a temperature sensor.